Batman Who Laughs #4 & The Merciless Dark MultiverseTHE BATMAN WHO LAUGHS He is Batman's greatest nightmare come to literal life. The Batman Who Laughs is Bruce Wayne from a world in the Dark Multiverse where he has been infected with The Joker's nanotoxin. Possessing a mind capable of thinking like both Batman and his greatest nemesis the Batman Who Laughs has risen to a higher power than any mortal before him. THE MERCILESS From Earth 12 comes the bloodthirsty Merciless, a nightmarish fusion of